Formation of periodic layered structure during reaction between Co2Si and liquid Zn

Abstract

Reactions of Co 2 Si alloy with liquid zinc for annealing time up to 720 minutes were studied by means of scanning electron microscope, energy-dispersive X-ray spectroscope and electron backscattered diffraction techniques. The results showed that periodic patterns, Co 2 Si / (γ 2 + η-Zn), were observed in the reaction zone, and its thickness and morphology were dependent on the crystallographic orientation of Co 2 Si grain. The relationship between anisotropy growth of the periodic patterns and crystal structure was explained with the concept of dangling bonds. The thermodynamic foundation and mechanism of formation of the periodic layered structure were elaborated in this paper.